Hello,
It is the Fibonacci 's suit.

Answer:
the slope is -1/7 hope this helps
Answer:
0 4 9 1
_____________
1 9 9 3 2 9
− 0
9 3
− 7 6
1 7 2
− 1 7 1
1 9
− 1 9
0
Step-by-step explanation:
Sorry of this isn't clear
It is true because if a is perpendicular to b and b is perpendicular to c therefore a has to be perpendicular to c also they said that all three lines are coplanar therefore the statement must be true
I hope this helped you out :)